Ohaeles t



(No ModeL) 0. T. DAY.

DERRIGK.

No. 298,184. Patented Mayfi, 1884.

INVENTOR WITNESSES By flftorney jar/es m G 151%,

N. PETERS. FhnlmLilhngrApher. Walhingtnn. n. c.

CHARLES T. DAY, OF NEW ARK, NEW JERSEY, ASSIGNOR OF ONE-HALF TO THOMASJ. GRAY, OF SAME PLACE.

DERRICK.

SPECIFICATION forming part of Letters Patent No. 298,18, dated May 6, 1884.

Application filed March 19, 1854. (No model.)

To all whom, it may concern/.

Be it known that I, GHARLEs T. DAY, a citizen of the United States, residing at Newark, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Derricks, of which the following is a specification.

My'invention principally relates to derricks having a pivoted arm or boom adapted to be raised and lowered toward and from the mast, upon and from which boom the load is raised and suspended for removal.

. The object of the invention is to provide means for conveniently and easily removing the load to and from points situated at different distances from the mast by shifting the load, when suspended, toward or from the mast to its place of removal.

To this end the main features of my invention consist, first, in the cable by which the load is suspended being fastened to the mast or other fixed support and passing over a pul ley on the boom, whereby the raising and lowering of the boom will cause the said pulley thereon to travel over said cable,and the point on the boom from which the load is suspended thus be carried toward or from the mast, and the load by gravitybe correspondingly shifted; second, in the combination,with said cable and the boom having a pulley adapted to travel over the same, of an endless chain or cable passing over pulleys, one of which rotates correlatively with the first-named pulley, where by the movement of said chain over its pulleys will cause said first-named pulley to travel over said cable by which the load is suspended and the boom be raised or lowered and the load shifted thereby; and, third, in the traveling connection of said cable, by which the load is suspended, with the pulley over which it passes, being formed by winding the cable.

around the pulley, so that the strain of the load upon the cable will tighten the cable to said pulley, and the cable thus itself act as a stay to prevent the boom from lowering under the weight of the load.

The invention also consists in the specific arrangement of the cables and their pulleys,

and in details of mechanism, as hereinafter fully set forth and claimed.

In the accompanying drawings, Figure 1 is a side elevation of my improved derrick.

Fig. 2 is an end view of the boom, showing the peripheries of the pulleys on the end of the boom and their attachment theretopand Fig. 3 is a front view of the lower portion of the mast, showing the periphery of one of the pulleys over which the endless chain passes and parts adjacent to said pulley.

Referring to the drawings, A represents a mast, which may be pivoted at its base and top on its longitudinal axis, and be supported in an upright position by means of guys or stay-ropes a, as is well understood. The boom B is pivoted at its lower end to an arbor, b, mounted in the supporting-plates b, secured to the sides of the mast. The cable by which the load is suspended is fastened at g to the mast, and passes over the pulley d on the boom, as shown, and depends below said pulley to suspend the load. This cable preferably extends back over the pulleys d on the boom and 0' on the mast, and is connected at its opposite end to the Windlass O. The cable is thus formed into a loop comprising the two 7 5 sections a c and bight c". Ablock or sheave,

e, is suspended in the bight c, and to this block the load is attached, as shown. The pulley (I, over which the section 0 of the cable 0 0 passes, may preferably have a roughened 8o periphery, and the cable be wound around it in preferably one complete convolution, as

shown in Fig. 2, so that the cable will not slip over the pulley independently of the rotation of the latter.

cable 0 0 upon the windlass O, by which action the loop into which said cable is formed is shortened, and the bight c, with the load L, is raised upward toward the boom. Theload 0 may be lowered from the boom by a reverse movement of the windlass and the lengthening of the loop, as will be readily understood.

The Windlass C may be of any well-known and suitable construction, and may be oper- 5 ated either by steam or hand power. Ihave,

The load is raised upon the I boom by the coiling of the section 0 of the however, for convenience, illustrated a handwindlass of well-known operation.

It will be seen that when the load is suspended from the bight c of the cable 0 c the strain of the load will bind the section a of the cable around the pulley d, and the portion of said section between the pulley d and the mast will act as a stay and prevent the boom from lowering under the weight of the load; but the pulley (i may. at the same time be caused to travel over said cable, as hereinafter described.

For the purpose of raising and lowering the boom, by causing its pulleys d d to travel over the cable 0 c, I prefer to employ an end less chain, I, passing over chain-pulleys iand '1 which pulleys may be of any of the wellknown constructions, having notches or pro jections upon their peripheries for interlocking with the links of the chain. The chainpulley i is mounted upon a spindle,j, on which the pulley (Z is also mounted, so that said chain-pulley i may rotate correlatively with the pulley (I. The spindle j is mounted in a bifurcated support, 70, secured to the end of the boom. The chain-pulley i is pivoted to a projecting end of the arbor b, and is provided with a handle, 0, by which it may be turned. A notched flange or ratchet, p, is cast with or attached to the side of the rim or felly of the pulley-wheel i, and extends entirely around the side of said rim. Two pawls, m. and m, are piy'oted to the plate I), and engage in opposite directions with the ratchet so as to lock the pulley-wheel 13 against rotation in either direction. It will therefore be understood that by disengaging the pawl m from the ratchet p and rotating the pulley-wheel i to the right the chain -pulley1', and consequently the pulley (I, will be rotated in the opposite direction and the pulley d be caused to travel toward the mast over the cable 0 c, and the boom be raised to any desired height, and that by disengaging the pawl m and rotating the pulley-wheel '1 in the opposite direction, or from the mast, the pulley (I will be made to travel over said cable in a direction away from the mast and the boom be lowered. Therefore, in hoisting and removing aload according to my invention, the boom may be adjusted toward or from the mast by means of the chain I and its pulleys until the. block depends above the point where the load lies, when the load is attached to the block and is hoisted upon the boom by the windlass, as hereinbefore described, and the load is then shifted sidewise by gravity upon raising or lowering the boom by means of the endless chain I to a position above the point where the load is to be deposited, when the load may be lowered from the boom by the operation of the windlass. The pawls m and m serve to lock the boom in posit-ion through the pulleys i i and chain I, and respectively prevent the falling or lowering of the boom under its own weight when the load is detached, and to hold the boom against any possible tendency to raise itself automatically when the load is suspended from it. The boom may, however, be prevented from lowering too far by means of a stay-rope, 'r. This rope is attached at one end to the boom, as shown, and passes over the pulley f on the mast, and may be secured at its other end to the cleat s. \Vhen the stay-rope r is employed, the pawl m, for preventing the movement of the chain I and pulley i in a direction to lower the mast, may or may not be employed, as may be found preferable.

An endless rope or cable passing over ordinary pulloys may be substituted for the chain I and the chainpulleys, if desired but I prefer to make use of said chain and its pulleys, arranged as shown in the drawings.

\Vhat I claim herein as my invention is- 1. The combinatiomwith the pivoted boom of a derrick, of a cable for suspending the load from said boom, said cable being fastened to a fixed support and passing over-a pulley on the boom, whereby the raising and lowering of the boom will cause said pulley to travel over said cable and the load to be shifted sidewise, substantially as herein set forth.

2. The combination,with the pivoted boom of a derrick, of a cable for suspending the load from said boom, said cable being fastened to a fixed support and passing over a pulley 011 the boom, and an auxiliary chain or cable for raising orlowering said boom, thereby causing said pulley to travel over the firstnamed cable, substantially as herein set forth. 3. The combination,with the pivoted boom of a derrick, of a cable for suspending the load from said boom, said cable being fastened to a fixed support and passing over a pulley on the boom, and an endless chain or cable passing over pulleys, one of which retates correlatively with the first-named pulley, substantially as herein set forth.

4. The eombination,with the pivoted boom of a derrick, of a cable fastened at one end to a fixed support and passing over a pulley on the boom to forma traveling connection therewith, and formedinto a loop having a bight below said pulley, from which bight the load is suspended, said cable being connected at its opposite end to the hoisting-Windlass, substantially as herein set forth.

5. The combination,with the pivoted boom of a derrick, of a cable fastened at one end to a fixed support and passing over a pulley on the boom to form atraveling connection therewith, and formed into a loop having a bight below said pulley, from which bight the load is suspended, said cable being connected at its opposite end to the hoisting-Windlass, and an endless chain or cable passing over pulleys, one of which rotates correlatively with said pulley on the boom over which the first-named cable passes, substantially as herein set forth.

6. The combination,with theboom of a derrick, of a cable fastened to a fixed support and passing over and wound around a pulley on the boom and depending below said pulley to suspend the load, whereby the boom will be stayed by the weight of the load, but may be raised and lowered by causing its said pulley to travel over said cable, and the suspended load thereby be shifted, substantially as herein set'forth.

7. The combination,with the boom of a derrick, of a cable fastened at one end to a fixed support and passing over and wound around a pulley on the boom, and formed into a loop having a bight below said pulley, from which bight the load is suspended, said cable being connected at its opposite end to the hoistingwindlass, substantially as herein set forth.

8. The combination of the mast, the boom, the cable formed into a loop, from the bight of which the load is suspended, said cable having one of its ends fastened to the mast and its other end connected to the hoisting-windlass, and thetwo pulleys on the boom, over which the two sections of said cable respectively pass, substantially as herein set forth.

9. The combination of the mast, the boom, the cable formed into a loop, from the bight .of which the load is suspended, onesection of which cable is fastened to the mast and the as herein set forth.

10. The combination of the boom, the cable by which the load is suspended therefrom, the endless chain, the chain-pulleys, the ratchet fixed to one of said chain-pulleys, and a pawl or pawls engaging with said ratchet, substantially as herein set forth;

11. The combination of the boom, the cable by which the load is suspended, the pulley d on the boom, over which said cable passes, the chain-pulley t, mounted upon the same spindle with said pulley d, thechain-pulley i, and the endless chain I, passing over said chainpulleys, substantially as herein set forth.

In testimony whereof I have hereunto set my hand this 15th day of March, A. D. 1884.

CHARLES T. DAY.

Witnesses:

MILLER O. EARL, AUGUST W. ROsINGER. 

